Hader Bar The Hader Bar is a resilient economical bar joint system. It can be used with ceramic abutment crowns in partial denture applications and is a popular treatment plan for over dentures and implants. The bar requires at least two abutments and provides greater stability than studs.  The yellow Hader clips are nylon and easily replaceable but not adjustable. They provide rotational movement only.  The bar pattern may be cut to follow the arch and it’s gingival skirt shaped to fit the contour of the soft tissue.